Former DNI: Little progress on missing airliner

Former Director of National Intelligence John Negroponte on Sunday said he would be “wary” putting forth any one theory on the mysterious disappearance of Malaysia Airlines Flight 370.

Appearing on CNN's "State of the Union," he said that the leaders of the investigation “are pretty much at tabula rasa, they’re really starting from the beginning. There’s I don’t think anything definitive out there.”

“All doors and all possibilities, in my mind, are still open,” he added.